ABSTRACT

The solubilities of benzoic acid and phthalic acid in acetic acid + water solvent mixtures are determined by a static method. The experimental temperature ranges from (298.3 to 367.9) K, and the mass fraction of acetic acid in the solvent mixtures ranges from 0.8 to 1.0. The experimental results show that, within the temperature range of the measurements, the solubility of benzoic acid and phthalic acid in all the mixtures shows an increasing trend as the temperature increases. The solubility of benzoic acid decreases with increasing mass fraction of water. For the solubility of phthalic acid in acetic acid + water within the solvent composition range of the measurements, below 325.2 K, the higher the mass fraction of water, the less the solubility. However, above 325.2 K the higher the mass fraction of water, the greater the solubility. A simple explanation was given for this maximum-solubility effect . The experimental data was correlated by the Non-Random Two Liquids (NRTL) activity coefficient model, and the model parameters were regressed.

Compounds

#	Formula	Name
1	C7H6O2	benzoic acid
2	H2O	water
3	C8H6O4	1,2-benzenedicarboxylic acid
4	C2H4O2	acetic acid

Datasets

The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type	Compound-#	Property	Variable	Constraint	Phase	Method	#Points
POMD	4	Refractive index (Na D-line) ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Standard Abbe refractometry	1
POMD	4	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Pycnometric method	1
POMD	4 1 2	Mass ratio of solute to solvent - 1 ; Liquid	Solvent: Mass fraction - 4; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid Crystal - 1	gravimetric analysis	28
POMD	4 3 2	Mass ratio of solute to solvent - 3 ; Liquid	Solvent: Mass fraction - 4; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid Crystal - 3	gravimetric analysis	40
POMD	4 1	Mass ratio of solute to solvent - 1 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid Crystal - 1	gravimetric analysis	7
POMD	4 3	Mass ratio of solute to solvent - 3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid Crystal - 3	gravimetric analysis	8

Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

Solubilities of Benzoic Acid and Phthalic Acid in Acetic Acid + Water Solvent Mixtures

Wang, Q.[Qinbo], Hou, L.[Linxi], Cheng, Y.[Youwei], Li, X.[Xi]

ABSTRACT